Choosing among FPV radios & batteries is less about finding one universal winner and more about matching the hardware to your aircraft or charging setup. The four choices here cover very different jobs: a Sky Viper battery-and-charger set, two DJI FPV charging accessories, and a RadioMaster ExpressLRS receiver. Start with the hardware role, then use price and condition to narrow the decision.
Quick take
- For a named Sky Viper drone: The Battery & Charger Set 750mAh is the direct battery-and-charger match.
- For DJI FPV power input: The Genuine DJI FPV Drone Battery Charger AC Power Adapter CDX170-90 includes a power cord.
- For charging additional DJI FPV batteries: The Genuine DJI FPV Battery Charging Hub expands from a DJI FPV charger and charges in sequence.
- For model control hardware: The RadioMaster ER4 is a 2.4GHz ExpressLRS PWM receiver for small aircraft, boats, cars, and similar models.
Listed price comparison
The prices span from USD 12.00 to USD 36.80, a USD 24.80 spread across accessories with different purposes.
| Product | Listed price | Price bar |
|---|---|---|
| Battery & Charger Set 750mAh for Sky Viper s1700 s1750 V2400HD V2450FPV V2450GPS | USD 12.00 | |
| RadioMaster ER4 ExpressLRS (ELRS) 2.4GHz 4-Channel Receiver [RM-HP0157.RX-ER4 | USD 17.49 | |
| Genuine DJI FPV Drone Battery Charger AC Power Adapter CDX170-90 25.2V 3.4A 86W | USD 29.99 | |
| Genuine DJI FPV Battery Charging Hub Multiple Battery Charger Manager | USD 36.80 |
Decision matrix
- Battery replacement plus charging: Choose the Sky Viper set when the named drone models match your setup. Its role is more focused than the DJI accessories.
- AC adapter for DJI FPV: Choose the CDX170-90 when you need the charger-and-power-cord format rather than a battery hub.
- Sequential charging for multiple DJI FPV batteries: Choose the charging hub when expanding from a compatible DJI FPV charger is the priority.
- ExpressLRS control connection: Choose the RadioMaster ER4 when your model needs a 2.4GHz PWM receiver rather than battery or charging hardware.
Product notes
Battery & Charger Set 750mAh for Sky Viper s1700 s1750 V2400HD V2450FPV V2450GPS
At USD 12.00, this set is the direct choice for replacing a battery and charger for a named Sky Viper drone. The title identifies a 750mAh battery, while the description names Sky Viper s1700, s1750, FURY V2400HD, V2450FPV, V2450GPS, SCOUT, and JOURNEY models. That gives shoppers a concrete model-based reason to choose it. The limitation is compatibility scope: the fit language centers on those Sky Viper models rather than a general FPV setup. Choose it for that Sky Viper use case; choose another item here when the need is DJI FPV charging or ExpressLRS receiver hardware.
Genuine DJI FPV Drone Battery Charger AC Power Adapter CDX170-90 25.2V 3.4A 86W
The CDX170-90 is a clear match for shoppers seeking a Genuine DJI FPV Drone Battery Charger AC Power Adapter. Its title specifies 25.2V, 3.4A, and 86W, and the description says a power cord is included. The model number is also identified as CDX170-90, making the item easier to distinguish from the separate DJI charging hub. The concrete limitation is packaging: the description calls it brand new in bulk non-retail packaging. It is an AC power adapter, so it suits a power-input need rather than the sequential multi-battery function handled by the hub.
Genuine DJI FPV Battery Charging Hub Multiple Battery Charger Manager
At USD 36.80, the Genuine DJI FPV Battery Charging Hub Multiple Battery Charger Manager is aimed at expanding a DJI FPV charging setup. The description says it connects to a DJI FPV charger, can charge three additional batteries, and charges them in sequence. Its listed charging time is about 55 minutes, subject to temperature. Those details make it the clearest fit when managing multiple DJI FPV batteries is more important than buying a standalone adapter. The limitation is condition: the item is marked open box. Shoppers prioritizing a new charger should consider the CDX170-90 instead.
RadioMaster ER4 ExpressLRS (ELRS) 2.4GHz 4-Channel Receiver [RM-HP0157.RX-ER4
The RadioMaster ER4 is the distinct control-hardware choice at USD 17.49. It is a 2.4GHz ExpressLRS PWM receiver with four simultaneous PWM channels, and its description positions it for small aircraft, boats, cars, and other models where lightweight functionality matters. The description also identifies long-range capability, which fits shoppers searching for an ExpressLRS receiver rather than a battery accessory. Its limitation is category fit: it does not provide battery power or charging. Choose it when the build needs receiver hardware; do not substitute it for either DJI charging accessory or the Sky Viper set.
Final recommendation by use case
For a Sky Viper s1700, s1750, V2400HD, V2450FPV, or V2450GPS setup, choose the Battery & Charger Set because its title and description directly name those models. For a DJI FPV AC power adapter, choose the CDX170-90, especially if the included power cord matters. For expanding DJI FPV charging to additional batteries, choose the open-box Charging Hub. For a small model using ExpressLRS PWM control, choose the RadioMaster ER4. The USD 24.80 price spread reflects these different hardware roles, not a like-for-like quality ranking.
